// Safe to call from types that are not fully set up.
func isUntyped(t Type) bool {
	return !isTyped(t)
}

// isUntypedNumeric reports whether t is an untyped numeric type.
// Safe to call from types that are not fully set up.
func isUntypedNumeric(t Type) bool {
	// Alias and named types cannot denote untyped types
	// so there's no need to call Unalias or under, below.
	b, _ := t.(*Basic)

// isUntyped(t) is the same as !isTyped(t).
// Safe to call from types that are not fully set up.
func isUntyped(t Type) bool {
	return !isTyped(t)
}

// isUntypedNumeric reports whether t is an untyped numeric type.
// Safe to call from types that are not fully set up.
func isUntypedNumeric(t Type) bool {
	// Alias and named types cannot denote untyped types
	// so there's no need to call Unalias or under, below.
	b, _ := t.(*Basic)